/* * Copyright (C) 2012 Red Hat, Inc. * * This file is released under the GPL. */ #include "dm-bitset.h"#include "dm-transaction-manager.h" #include <linux/export.h>#include <linux/device-mapper.h> #define DM_MSG_PREFIX "bitset"#define BITS_PER_ARRAY_ENTRY 64 /*----------------------------------------------------------------*/ static struct dm_btree_value_type bitset_bvt = {	.context = NULL,	.size = sizeof(__le64),	.inc = NULL,	.dec = NULL,	.equal = NULL,}; /*----------------------------------------------------------------*/ void dm_disk_bitset_init(struct dm_transaction_manager *tm,			 struct dm_disk_bitset *info){	dm_array_info_init(&info->array_info, tm, &bitset_bvt);	info->current_index_set = false;}EXPORT_SYMBOL_GPL(dm_disk_bitset_init); int dm_bitset_empty(struct dm_disk_bitset *info, dm_block_t *root){	return dm_array_empty(&info->array_info, root);}EXPORT_SYMBOL_GPL(dm_bitset_empty); int dm_bitset_resize(struct dm_disk_bitset *info, dm_block_t root,		     uint32_t old_nr_entries, uint32_t new_nr_entries,		     bool default_value, dm_block_t *new_root){	uint32_t old_blocks = dm_div_up(old_nr_entries, BITS_PER_ARRAY_ENTRY);	uint32_t new_blocks = dm_div_up(new_nr_entries, BITS_PER_ARRAY_ENTRY);	__le64 value = default_value ? cpu_to_le64(~0) : cpu_to_le64(0); 	__dm_bless_for_disk(&value);	return dm_array_resize(&info->array_info, root, old_blocks, new_blocks,			       &value, new_root);}EXPORT_SYMBOL_GPL(dm_bitset_resize); int dm_bitset_del(struct dm_disk_bitset *info, dm_block_t root){	return dm_array_del(&info->array_info, root);}EXPORT_SYMBOL_GPL(dm_bitset_del); int dm_bitset_flush(struct dm_disk_bitset *info, dm_block_t root,		    dm_block_t *new_root){	int r;	__le64 value; 	if (!info->current_index_set)		return 0; 	value = cpu_to_le64(info->current_bits); 	__dm_bless_for_disk(&value);	r = dm_array_set_value(&info->array_info, root, info->current_index,			       &value, new_root);	if (r)		return r; 	info->current_index_set = false;	return 0;}EXPORT_SYMBOL_GPL(dm_bitset_flush); static int read_bits(struct dm_disk_bitset *info, dm_block_t root,		     uint32_t array_index){	int r;	__le64 value; 	r = dm_array_get_value(&info->array_info, root, array_index, &value);	if (r)		return r; 	info->current_bits = le64_to_cpu(value);	info->current_index_set = true;	info->current_index = array_index;	return 0;} static int get_array_entry(struct dm_disk_bitset *info, dm_block_t root,			   uint32_t index, dm_block_t *new_root){	int r;	unsigned array_index = index / BITS_PER_ARRAY_ENTRY; 	if (info->current_index_set) {		if (info->current_index == array_index)			return 0; 		r = dm_bitset_flush(info, root, new_root);		if (r)			return r;	} 	return read_bits(info, root, array_index);} int dm_bitset_set_bit(struct dm_disk_bitset *info, dm_block_t root,		      uint32_t index, dm_block_t *new_root){	int r;	unsigned b = index % BITS_PER_ARRAY_ENTRY; 	r = get_array_entry(info, root, index, new_root);	if (r)		return r; 	set_bit(b, (unsigned long *) &info->current_bits);	return 0;}EXPORT_SYMBOL_GPL(dm_bitset_set_bit); int dm_bitset_clear_bit(struct dm_disk_bitset *info, dm_block_t root,			uint32_t index, dm_block_t *new_root){	int r;	unsigned b = index % BITS_PER_ARRAY_ENTRY; 	r = get_array_entry(info, root, index, new_root);	if (r)		return r; 	clear_bit(b, (unsigned long *) &info->current_bits);	return 0;}EXPORT_SYMBOL_GPL(dm_bitset_clear_bit); int dm_bitset_test_bit(struct dm_disk_bitset *info, dm_block_t root,		       uint32_t index, dm_block_t *new_root, bool *result){	int r;	unsigned b = index % BITS_PER_ARRAY_ENTRY; 	r = get_array_entry(info, root, index, new_root);	if (r)		return r; 	*result = test_bit(b, (unsigned long *) &info->current_bits);	return 0;}EXPORT_SYMBOL_GPL(dm_bitset_test_bit); /*----------------------------------------------------------------*/